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California water resource region facts for kids

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The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.

The California region, which is listed with a 2-digit hydrologic unit code (HUC) of 18, has an approximate size of 168,579 square miles (436,620 square kilometers), and consists of 10 subregions, which are listed with the 4-digit HUCs 1801 through 1810.

This region includes the drainage within the United States that ultimately discharges into the Pacific Ocean within the state of California; and those parts of the Great Basin (or other closed basins) that discharge into the state of California. Includes parts of California, Nevada, and Oregon.

HUC18
The California region, with its 10 4-digit subregion hydrologic unit boundaries.

List of water resource subregions

Subregion HUC Subregion Name Subregion Description Subregion Location Subregion Size Subregion Map
1801 Klamath–Northern California Coastal subregion The drainage into the Pacific Ocean from and including the Smith River Basin to and including the Stemple Creek Basin. California and Oregon. 24,800 sq mi (64,000 km2)
HUC1801
1802 Sacramento subregion The Sacramento River Basin and drainage into Goose Lake. California and Oregon. 27,600 sq mi (71,000 km2)
HUC1802
1803 Tulare–Buena Vista Lakes subregion The drainage into the Tulare and Buena Vista Lake closed basins. California 16,200 sq mi (42,000 km2)
HUC1803
1804 San Joaquin subregion The San Joaquin River Basin. California 15,600 sq mi (40,000 km2)
HUC1804
1805 San Francisco Bay subregion The drainage into the Pacific Ocean from the Stemple Creek Basin boundary to and including the Pescadero Creek Basin, excluding the Sacramento and San Joaquin River Basins. California 4,470 sq mi (11,600 km2)
HUC1805
1806 Central California Coastal subregion The drainage into the Pacific Ocean from the Pescadero Creek Basin boundary to and including the Rincon Creek Basin. California 11,400 sq mi (30,000 km2)
HUC1806
1807 Southern California Coastal subregion The drainage within the United States that discharges into the Pacific Ocean from the Rincon Creek Basin boundary to the California-Baja California international boundary. California 11,100 sq mi (29,000 km2)
HUC1807
1808 North Lahontan subregion The drainage east of the Sierra Nevada and north of the Truckee River Basin which includes the Lahonton closed basins that discharge into California. California and Nevada. 4,480 sq mi (11,600 km2)
HUC1808
1809 Northern Mojave–Mono Lake subregion The Closed Desert Basins that discharge into South Central California, including Mono Lake, Owens Lake, Death Valley, and the Upper Mojave Desert. California and Nevada. 28,000 sq mi (73,000 km2)
HUC1809
1810 Southern Mojave–Salton Sea subregion The closed desert basins in Southeastern California, including the Lower Mojave Desert and the Salton Sea. California 16,000 sq mi (41,000 km2)
HUC1810
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California water resource region Facts for Kids. Kiddle Encyclopedia.